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Yep, I've seen these sorts of predictions before. Find some old Popular Science mags from a few decades ago and see how many of the predictions they made have actually come true. It's fine to run an aircraft on hydrogen but first you need to make the hydrogen fuel and for that you need power. I don't believe that in the future we'll be able to generate any where near enough power for our most basic needs, let alone frivolous needs such as flying supersonically from Britain to OZ. Predict that in 50 years people will be embarking on fast sailing ships for a lengthy trip to Oz and I reckon you'll be closer to the mark.
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